How do you export a .blend group
The ~.blend file you wish to import must first include a group, which you create in your original project file, by any of the normal means of creating a group: selecting the elements you want in the group, and selecting the menu item Object > Group > Make Group when the viewport is in object mode, or using the defined shortcut key for this, CTRL-G, or alternatively by using the "add to Group" options under the Group pane in the "object properties" tab of the properties editor. If a group is defined in the file you are wanting to append or link from, when you select the append or link option in the files menu, after selecting the file, you will see in the list of items you can append or link, a listing for "group". Select this, and select the desired group, just as you would another data type, e.g., object, mesh, or material.